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The current gain for a transistor workin...

The current gain for a transistor working as a common-base amplifier is `0.96`. If the emitter current is `7.2 mA`, the base current will be

A

0.39mA

B

0.43 mA

C

0.35 mA

D

0.29mA

Text Solution

Verified by Experts

The correct Answer is:
D
We consider current gain , `alpha` for a common base amplifier .
`therefore alpha = I_C/I_E therefore 0.96 = I_C/7.2`
`therefore I_C=7.2xx0.96`=6.91 mA
The base current `I_B=I_C-I_E`= 7.2-6.91 = 0.29 mA
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